NOTE: uvot_fluxes_wget.pl vrs. 2018-11-07 fem at 190218d20h54m20s758984usUT
NOTE: Source region spec. is: 284.6454 -8.2374 3"
NOTE: Used archived uvot source position of 284.64540  -8.23740  3.00
NOTE: position reference is GCN_Notice
NOTE: A UVOT position was reported in GCN_Notice_Mon_18_Feb_19_09:25:15_UT
NOTE: Possible detection in uu at T+750.1
NOTE: Possible detection in wh at T+543.3
NOTE: Possible detection in bb at T+774.8
NOTE: Possible detection in w1 at T+725.3
NOTE: Possible detection in vv at T+850.0
NOTE: Possible detection in w2 at T+825.7
NOTE: Possible detection in m2 at T+700.4

=========== Draft Upper Limit Circular ========

GRB 190218: Swift/UVOT Upper Limits

S.W.K. Emery (UCL-MSSL) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190218
543 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
No optical afterglow consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           543          693          147         >16.4
white              543         6914          687         >16.7
v                  850         7325          491         >17.0
b                  775         6709          471         >17.3
u                  750         6504          477         >16.2
w1                 725         6299          294         >16.1
m2                 700        11222          966         >16.9
w2                 826         7119          491         >16.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.26 in the direction of the burst
(Schlegel et al. 1998).


=========== Draft Detection Circular ========

GRB 190218: Swift/UVOT Detection

S.W.K. Emery (UCL-MSSL) and ***BA*** (***BA INSTITUTION***)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 190218
543 s after the BAT trigger (***Author*** et al., GCN Circ. ????).
A source consistent with the XRT position
*** POSITION REFERENCE is GCN_Notice ***
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  18:58:34.90 = 284.64543 (deg.)
    Dec (J2000) = -08:14:14.6  =  -8.23740 (deg.)
with an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).

Preliminary detections using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: 

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              543          693          147         16.49 +/- 0.03
v                  850         1252           58         16.89 +/- 0.15
b                  775          795           20         17.00 +/- 0.13
u                  750          770           20         15.77 +/- 0.09
w1                 725          745           20         15.71 +/- 0.14
m2                 700         1102           39         16.64 +/- 0.19
w2                 826         1053           39         16.58 +/- 0.15

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.26 in the direction of the burst
(Schlegel et al. 1998).